All of the data collected were analyzed by using computerized statistic SPSS, by using t-test formula.
3.2. Area Determination Method
The area determination method of this research was conducted by using purposive method. Purposive method was used in this research to determine the
research area based on the certain purpose Arikunto, 2006:139. The research was conducted at SMP Negeri 1 Rowokangkung, Lumajang. This area of the research was
chosen purposively based on the result of preliminary study that teaching vocabulary by using Guessing and Speculating games with pictures had never been applied by
the English teacher. Therefore, the experimental research can be conducted at this school to get the data.
3.3 Respondent Determination Method
Arikunto, 2006:145 states that respondent is the person giving some responses or answering the researcher’s questions either orally or in the written form.
Respondents can be the samples of the population. The population of the research was grade 8 students at SMP Negeri 1 Rowokangkung, Lumajang in the 20102011
academic year that consists of five classes A to E. Each class consisted of 20 - 26 students. Cluster random sampling was applied to choose the research sample.
Therefore, the score from the teacher was analyzed by using ANOVA formula SPSS Application to know whether or not the classes are homogenous. If the result
of the ANOVA test is significant p 0.05 means the populations is heterogenic so the experimental group and control group are taken from two classes that have same
or the closest mean differences but if the population is homogenous, the experimental group and control group are taken randomly by lottery.
Notes: N : Score
CA : Correct Answer
Σitems : Total items of the questions So that, the maximum total score of the test is 100. The time allocation for doing the
test is 60 minutes. The researcher gave try out who were not the respondents. The aim of the try
out is to investigate whether or not the researcher-made test has the qualification of a good test. Hughes 1996:36 states that the reliability of the test deals with the
consistency of the test result when it is given in different time or occasion. In this research, the reliability of the test was established by administering try out to one
class of the existing seven classes which was not selected as the experimental group and the control group. The result was analyzed by using Product Moment Correlation
Formula and continued by applying Spearman-Brown formula Split Half Odd Even Technique.
The procedures of the try out are as follows: 1. After conducting the try out and giving scores to each item achieved by the
students, splitting the scores becomes two parts, odd numbers and even numbers.
2. Giving the sign X for the odd numbers and Y for the even numbers. 3. Analyzing the correlation between the X and Y by using Product Moment
Correlation formula:
� = �
12 11
=
�∑ − ∑ ∑ �∑
2
− ∑
2
[�∑
2
− ∑
2
]
Notes: �
: Reliability coefficient XY : The total numbers of odd items and even items
X : The total numbers of odd items
Y : The total numbers of even items
N : The number of respondent
In this research, an interview with the English teacher was conducted to obtain the supporting data concerning about the English curriculum used, the teaching
materials that are used in the eighth grade of Junior High School, the English books, teaching media and techniques that are used by the teacher. The interview was
conducted by using semi structured interview in which a list of questions and details will be developed to get the information needed during the process of interview
Arikunto, 2006:227.
3.4.3 Documentation
According to Arikunto 2006:158, documentation is written documents such as books, magazines, documents, rules, etc. Therefore, in this research, the data of the
documentation was the names of the respondents, the total number of grade 8students and the sore of final exam in first semester of grade 8 students of SMP Negeri 1
Rowokangkung, Lumajang.
3.5 Data Analysis Method
After the main data was collected, then the data was analyzed statistically by using t-test formula of 5 significant level in the SPSS computing system to know
whether or not the mean difference of using Guessing and Speculating games with pictures on vocabulary achievement was significant. The independent sample t-test
by SPSS was used to analyze the data obtained. An independent sample t-test was used when to compare the means of a normally distributed interval dependent
variable for two independent groups. The procedures to analyze the data were as follow:
a. Entering the data of the experimental and the control class by using SPSS data editor;
b. Examining the mean difference of the data by using Analyze-Compare Means-Independent Sample T-Test;
CHAPTER IV. RESEARCH RESULT AND DISCUSSION
This chapter presents the description of the experimental treatment, the results of the secondary data, the results of the primary data, the analysis of post test, the
hypothesis verification, and the discussion. The main activity of the research was to investigate whether or not there was a significant effect of using Guessing and
Speculating games with pictures on vocabulary achievement of grade 8 students at SMP Negeri 1 Rowokangkung, Lumajang.
4.1 The Description of the Treatment
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